Midgetguy
Headphoneus Supremus
Well, I'm looking at the 507. I prefer oval shaped cups on my headphones.
I personally don't like the look of the square-shaped Stax headphones. As long as the cups are large enough, I don't mind circular cups. Case in point: Fidelio X1 and my current favorite HE-560. And in my case, they both also happen to look very good. I think the SR007 and SR009 are the best looking headphones in the Stax range.